Molding composition



United States Patent 3,245,815 MOLDING COMPOSITION John A. Hedge, Secane, Pa., assignor to Sun Oil Company, Philadelphia, Pa., a corporation of New Jersey ice Deasphalter bottoms or rafiinate resulting from contacting at the above conditions with a solvent containing 85 vol. percent propane and 15 vol. percent butane had the following properties and composition.

No Drawing. Filed Mar- 11, 1963, Ser- N 264,031 5 s ifi gravity mo 1,067

1 Claim. (Cl. 106-202) Penetratiom at 77 F. 2 1s invention relates to improved molding composiat F 2 tions containing asphalt as a binder. '1' In the past asphalts have been combined with many i f different types of filler materials to produce molding comu e 5' percen g positions. These compositions are usually molded in o 3 g percen 1 49 desired shapes by the application of high pressure and 99 8 heat. It has also been observed that asphalts can be C 4 32') treated by chemical and physical processing to make more 9 car on ff Viscosity (Saybolt Furol seconds); e ective binders. t F 2980 The object of this invention is to provide an exception- 253 ally strong molding composition containing a cellulosic 400 71 filler bound with a particular type of asphalt. a

Asphalts colloidal Systems hfwmg a P Phase This material was used as the binder in the examples a d a COHUHUOPS phase The d15PeYSe Phase, the which follow. Suitable C -C solvent deasphalter botq 'compnses the Component of hlghest molecular toms for use in the molding compositions of the invention Weghtkfl0Wn 9 the art asphaltenes- They are are those having asphaltene contents ranging from about Sohds- The Continuous mtermlcenar P Fa name 20 to about 30 wt. percent and resin contents of 20-30 sents the components of lower molecular weight; and percent At least 20 percent resins and less these are known as fi h y are nonsohdsthan wt. percent asphaltenes are present in the binder. maltnes are P fllvlded for Purposeys of classlfica' The following examples show the results of binding tion into a resin fraction and an on fraction. One pro- [paper with the binder f the invention Wood chips for separfltms an P Into asphaltene, 1 wood flour, sawdust, straw, cornstalks, cotton fibers, celand 011 components is described in Asphalts and Allied 30 luloee flee, hagesse and mixtures of these and other Substances, A raham, thlrd edlt lony 1929, PP- lulosic and ligno cellulosic materials can be used as well. Asphaltenes are often more specifically defined by noting From 50 to 90 percent filler can be used the solvent used to separate them, e.g. naphtha asphal- In the following examples test blanks were prepared tenes, pentane asphaltenes and hexane asphaltenes. by thoroughly mixing the binder with ground paper and I have found that the bottoms product resulting from 30 molding the mixture in a Carver press at a pressure of the trea ment of asphaltic residuum with a normally 4000 p.s.i. and a temperature of 155 F. Molded blanks gaseous liquid hydrocarbon solvent contains a relative h i di i f 1 X 4 X 4; i he were the t t d distribution of asphaltene, resin and oil components which on a center-loading apparatus employing the procedure renders the product uniquely suitable as a binder for outlined in ASTM D1037-56T (modified). cellulosic materials. The results were as follows:

TABLE I Teststrips molded from paper and asphalt fractions Modulus of Percent Per- Molding Molding Ruptureat No. Binder Binder cent Temp. Pressure Room Paper F.) (p.s.i. Temp. (p.s.1.)

50 155 4, 000 3, 480 1 Propane-Butane Bottoms 33 67 155 4,000 3,800 21 79 155 4, 000 4, 275 2 Rename-Precipitated as- 38 67 200 4,000 2, 280

phaltenes. 3 Pentane-Precipitated as- 50 50 275 5,000 2,580

phaltenes. 4 100% Paper 100 275 5,000 1,320

Briefly, the deasphalting process comprises feeding asphaltic residuum to a pressurized contact tank and treating the feed with propane, butane or a mixture of these two C -C saturated hydrocarbons. The standard technique comprises countercurrent contacting of the downwardly moving feed with upwardly moving liquefied hydrocarbon solvent. Operating conditions include top tower temperatures of 1202l0 F., a pressure range of 200-550 psi. and solvent to oil ratios of 2.5/1.0 to 15.0/ 1.0 by volume. The usual feed for deasphalting has a boiling range of 800-1030 F., and A.P.I. gravity 70 the use of plasticizers ems of from 11.0 to 16.0 and pentane insolubles of 5. to 15 vol. percent.

least 50 wt. percent asphaltenes.

portion of asphaltenes and resins.

It is to be understood that the foregoing detailed description is given merely by way of illustration and many alterations can be made therein without departing from the spirit of the invention. This applies particularly to s-linking agents, additional binders such as synthetic polymers, coloring agents, surface coatings and the like.

The invention claimed is:

A molding composition comprising 50 to 90 wt. percent of a cellulosic: filler and from to 50 wt. percent of an asphalt separated from an asphaltic residuum charge stock !by means of extraction with a normally gaseous liquid hydrocarbon solvent selected from the group consisting of propane, butane and mixtures thereof said asphalt containing to Wt. percent of asphaltenes, 20-30 wt. percent resins and to wt. percent oil components.

References Cited by the Examiner UNITED STATES PATENTS Fulton et a1. 106282 Carr 208-6 Watson 2086 Corbett 106202 10 ALEXANDER H. BRODMERKEL, Primary Examiner. 

